Interfacing (DSI, CSI, I2C, etc.) • Re: DSI displays graphical output not rotated along with other output

Thank you both for your thorough feedback, greatly appreciated!

vc4 can only do H & V flips at a plane level, so only 0, 180, and the reflect_x and reflect_y flags can be achieved through that.

Do I understand correctly that the v3d driver and the vc4 hardware, respectively, cannot rotate the output by 90° and 270° and that I would have to rely on a compositor or the app itself to rotate the output?

Correct.
v3d drives the 3D hardware on Pi4 and Pi5. 3D can transform things in any number of ways.
vc4 drives the display pipeline (and also the 3D on Pi0-3). The display pipeline can do H & V flips on the fly. It can not do transpose.

TBH that is not unusual. I've just checked on this x86 laptop with i915 graphics, and it can only do rot0 or rot180 on a plane, no option for only H or V flip.

Statistics: Posted by 6by9 — Mon May 06, 2024 4:26 pm

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